Furnace bridge-wall.



No; 897,657. Patented Apr. l5, I902.

H. A. POPPENHUSEN. FURNACE BRIDGE WALL. (Application filed Oct. 31, 1901.)

NlTE rates ATENT. FFIGE.

HERMAN A. POPPENIIUSEN, OF EVANSTON, ILLINOIS.

FURNACE BRIDGE-WALL.

SPECIFICATION forming part of Letters Patent No. 697,657, dated April 15, 1902. Application filed October 81,1901. Serial No. 80,593. (No model.)

To all whom, it may concern:

Beit known that I, HERMAN A. POPPENHU- SEN, of Evanston, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Furnace Bridge- Walls; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in furnace bridge-walls and other walls having overhanging horizontal projections or ledges.

The invention is herein shown as applied to a bridge-wall of that kind, commonly used in connection with a traveling or chain grate, wherein the upper part of the wall is provided with an overhanging part or ledge which projects forwardly or toward the front of the furnace, so as to overhang the rear end of the grate.

The invention consists in the matters hereinafter described, and more particularly pointed out in the appended claims.

As shown in the accompanying drawings, Figure 1 is a sectional View taken on line 1 1 of Fig. 2, showing the upper part of a bridgewall, a portion of a water-tube boiler above the same, and the rear part of the chain grate. Fig. 2 is a transversevertical section of the same parts, taken on line 2 2 of Fig. 1, the section extending through one of the side walls of the furnace. Fig. 3 is a perspective view of one of the tiles constituting the overhanging part of the bridge-wall. Fig. 4 is a perspective view of one of the iron castings or anchors used for securing in place the tiles shown in Fig. l.

As shown in said drawings, A indicates the bridge-wall; B,the lower tubes of a water-tube boiler,whioh extend over the bridge-wall from front to rear of the furnace, and C the rear or inner portion of a chain grate.

The main or body portion of the wall A, together with the rear or inner portion thereof, is built of brick in the usual manner. The overhanging part is formed by a series of tiles D, preferably having flat parallel sides and arranged side by side across the entire width of the furnace. Said tiles are shaped to form horizontallyextending upper parts, which constitute the overhanging portion of the wall, and vertically-extending rear or inner parts, which are embedded in the bridge-Wall and constitute a part of the body of the wall, the lower and outer surfaces of said tiles being made concave, as shown, or of other form as required for giving the desired shape to the under surface of the overhanging part of the bridge-wall.

Provision is made for interlocking engagement of the rear or inner ends of the tiles D with the bridge-wall as follows: Each tile is provided at its lower rear part with two lateral recesses shaped to form between them a locking projection D, made wider at its lower than at its upper end and having lateral locking-surfaces (Z d. Secured or embedded in the wall itself are a series of anchor-blocks E, made wider at their upper than at their lower ends and having lateral locking-surfaces e e, which interfit with the lateral locking-surfaces 01 (l on the tiles. The anchor-blocks E are preferably made of metal and cast integral with horizontal base-plates E, from which the locking-blocks upwardly project, the base-plates being embedded in the masonry of the wall. Said anchor-blocks E and the projection D are herein shown as made of dovetail form. Each anchor-block E is, as clearly shown in Fig. 2, arranged to interlock with or fit against the lateral faces ddof the locking projections D on two adjacent tiles D. The inclined or otherwise suitably-shaped locking-surfaces d of the locking projections Don the tiles face laterally or toward the sides of the tiles, and the corresponding locking-surfaces e of the locking-blocks E also face laterally with respect to the tiles, the broader ends of the locking projections D being directed downwardly and the narrower ends upwardly, while in the case of the locking-blocks E the wider inner ends are upward and the narrower ends downward. As a result of this construction the tiles maybe interlocked with and disengaged from the locking-blocks by horizontal movement of the tiles inwardly or outwardly with respect to the bridge-wall. The flat bottom plates E of the several anchor-blocks rest upon and are built into the brickwork of the bridge-wall, as clearly shown in Fig. 1, so that said plates are firmly embedded therein, said plates, as

herein shown, extending both inwardly and outwardly from the blocks, so that they project into the masonry of the rear part of the bridge-wall and also extend under the bottom faces of the several tiles D. The said plates and the locking-blocks attached thereto are thus anchored firmly in the bridgewall, so that when the tiles are engaged with the locking-blocks the rear or inner ends of the tiles are held from rising and the forward or overhanging ends thereof are thereby sustained in horizontal position. The tiles may be additionally held or secured in place by layers of brick, as indicated at A, extending over the top' of the rear part of the bridgewall and over the top of the tiles beneath the boiler-tubes which extend over the bridgewall.

As a further improvement I provide in the bridge-wall, between the rear edges of the tiles and the part of the bridge-wall behind the same, a vertical air-passage F, which extendslengthwise of the bridge-wall. Said passage communicates with the outer air through a space or opening F, which is formed in the side wall A of the furnace and which constitutes an extension or continuation of the passage F, as clearly shown in Fig. 2. Said passage F will preferably communicate with the outer air through the side walls at both sides of the furnace, if this be practicable; but in any event the said passage being in communication with the outer air through one or both of the side walls of the furnace permits the circulation of air through the bridge-wall and in contact with the rear surfaces of the locking-blocks, so as to keep the same cool and prevent them from being overheated through heat transmitted thereto from the interior of the furnace.

Two or more or all of the anchor-blocks E may be formed or cast on a long or continuous horizontal base-plate; but the construction illustrated, wherein each anchor-block is provided with a separate base-plate, is preferred, because enabling the number of anchor-blocks used to correspond with the nu mber of tiles required for filling the space between the side walls of the furnace, whatever he the width of the latter. The purpose of the anchor-blocks being to hold the inner edges of the tiles in the bridge-wall in a manner to prevent the same from rising, it is manifest that this result will be produced as well by using separate anchor-castings, each consisting of a single anchor-block and baseplate attached thereto, as by a construction in which the several lugs are cast upon a single base-plate.

While I have shown the several tiles as provided each with a locking projection having lateral locking-faces, yet it will be understood that substantially the same result would be produced if each tile were provided with lateral locking-surfaces otherwise formed-as, for instance, if the tile had two inwardly-facing locking shoulders or surfaces formed on two lateral projections instead of outwardlyfacing shoulders formed on a central projection. It will be further understood that while the locking projections on the tiles and the anchor-blocks are shown as made of dovetail form yet this particular shape in the said parts is not essential, inasmuch as the proper interlocking of the blocks with the lockingsurfaces on the tiles may be afforded by locking-surfaces of any form, provided the upper parts of the blocks and the lower parts of the locking projections on the tile be wider than the lower and upper parts of said blocks and projections, respectively.

The construction described not only affords a simple and convenient way of securing overhanging tiles in a bridge or other wall, but it also enables the overhanging individual tiles to be easily removed and replaced in making repairs, it being obvious that by reason of the formation of the interlocking surfaces of the tiles and anchor-blocks on the lateral faces of the parts any one or more of the tiles may be engaged with and disengaged from the anchor-castin gs by ahorizontal movement without disturbing other parts of the wall or adjacent tiles.

,A special advantage arising from the use of separate anchor-castings,each consisting of a block E and base-plate E, is that while a continuous base-plate extending lengthwise of the wall would by its expansion and contraction tend to displace and loosen the masonry of the wall the separate castings described will have no such tendency and may expand and contract without disturbing the parts of the wall in which they are embedded.

I claim as my invention- 1. A masonry furnace-wall provided with an overhanging part which consists of tiles having locking-surfaces at their inner ends and anchor-blocks having interlocking con nection with the wall and having locking-sur faces which engage the said locking-surfaces of the tiles.

2. A furnace bridge-wall provided with an overhanging part which consists of tiles which project horizontally forwardly from the bridge-wall, and anchor-blocks having interlocking connection with said bridge-wall and also with said tiles.

3. A wall having an overhanging part which consists of a plurality of tiles having locking projections on their inner ends and metal anchor-blocks provided with integral, horizontal base-plates which are embedded in the wall, said anchor-blocks having interlocking engagement with the projections on the said tiles.

4. A wall comprising a tile which overhangs the face of the wall, and is provided at its inner end with a projection which is wider at its lower than at its upper part,and a metal anchor-block having an integral, horizontal bottom plate which is embedded in the wall, said 10 also with said tiles, said wall being provided with a longitudinal air-space afiording access of air to said metal anchor-blocks.

In testimony that I claim the foregoing as my invention I affix my signature, in presence of two witnesses, this 28th day of October, 15

HERMAN A. POPPENHUSEN. Witnesses:

C. CLARENCE PooLE, WILLIAM L. HALL. 

